Malicious PDF — malware analysis report

Static analysis result for SHA-256 65193588d27b6dbc…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 01:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2f95472fc87686a932ade36492cde80 SHA-1: 02fe5eab9c0bb1ae5805627dc76ca51ef08ce4cb SHA-256: 65193588d27b6dbc4524d0be13c6e9faa105ffc8e264cd4cd68ed32af2db24b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of external URIs and link farms on disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=time+and+calendar+worksheets+for+grade+4+cbse PDF link annotation
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe65dcf2d0---21101969381.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/67329955221.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pokak.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4c00596f95d021c14c7679adea8e3509/biwiwep.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/83120642165.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/6219815147.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kc2onbfic0fcogpbiv1sjutg92/68607445525.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/dususudivujazunivix.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/lizirepaxe.pdfIn PDF document text
    • http://master-br.ru/img/file/koxumojasajepalofozufid.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/zopibisigugudutumawuk.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b277089c860---23619097395.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/64798158653.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/dodejavanavulokoviwajo.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/23678656282.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7geelcc81enre6j8jtm0a9sph7/zivezumogaga.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/41993334028.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/opl39vf61hla68lre10s3t1gk7/sotatusagiv.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/fa2233960f56891f61fb653ae7992096/40237224649.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c9b2bf86---57813459485.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ab954673---mexolaxugijazotekafureme.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wizij.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/35863859922.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 18792 bytes
SHA-256: f3a0e0d54785aa13236e29671e0758516a6b4c391ed93e8d7e83b3e487432cc4
font_02_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 11284 bytes
SHA-256: eabf29cf08d9e1f2440492f5a71f3cee26cb05c1f42e14227a6c4f2452a41b5e

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